2025-12-01 – Weekly Dental Assistant News : CBCT tech mistakes cotton roll for bone

Last week’s discussions in our community were quite engaging, with members sharing insights and questions on the use of Cone Beam Computed Tomography (CBCT) in dental practices. A recurring theme was the challenges faced when technology misinterprets dental materials, sparking a wide-ranging discussion on troubleshooting and best practices. Additionally, there were conversations about updates in dental assistant certification requirements and tips for managing patient anxiety.


This Week’s Hot Topics

When the CBCT auto‑seg thinks cotton roll is bone
This thread delves into a quirky yet serious issue where CBCT technology misidentifies a cotton roll as bone. It’s a great read if you’re interested in how tech glitches can affect dental diagnostics and the practical steps you can take to address them.
Read more here


Looking forward to another week of learning and sharing together. Stay curious and keep the discussions going!

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Had this last week — ‘cotton roll’ read as bone; remove cotton, use bite block, MAR off, or narrower FOV.

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We ditched individual “QR badges” and put one laminated QR at the front desk that opens a Microsoft Form for patient check-in — way fewer fumbles and it pushes straight to Excel. , it falls apart if the Wi‑Fi hiccups, so we keep a tiny paper log as backup. If you want to try it, this setup guide helped: https://support.microsoft.com/en-us/office/send-a-form-and-collect-responses-1c64795a-57fb-435e-8c39-e39f2bdbd63d — anyone compare this to kiosk apps?

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Kind of like @carlson81’s one-laminate idea, we stuck a laminated “CBCT prep” card by the unit — no cotton rolls, bite on the plastic peg, tongue down — then do a 10‑sec scout; catches “ghost bone” before the full scan and saves dose. If a bite block isn’t tolerated, I use a thin dry‑angle and switch to the bone/sharp reconstruction, nudging the threshold so soft material doesn’t pose as cortex.

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We added a pre-scan CBCT checklist: “no thyroid collar, no earrings.” @carlson81. Fewer artifacts; if needed, lower kVp slightly.

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